Through Facebook I asked Jon Natchez how to play the song on accordion.

And he answer me this:

Jon Natchez September 22, 2009 at 12:02pm

“Hi Daniel. Here’s the accordion part, straight from Perrin:

“Here’s how to play Mimizan. The song is originally in F#, but here it is transposed to G to make it better to play.
the song is a waltz with 2 parts. Left hand chords are on the bottom line, right hand melody is the top line.Part 1:
A B B , A B B, A B B, A B A, C B B, C B B, C B B, C B C
G G G G C C C C

Thanks, Natchez. With my band ( The Flying Beirut Orkestar ) I play this song alone with violin and voice. In the other songs we have mandolin, flute, two violins, two ukes, two guitars, drums, all at the same time. Take a look.